EP3192204B1 - Funkzugangsknoten, kommunikationsendgerät und darin durchgeführte verfahren - Google Patents

Funkzugangsknoten, kommunikationsendgerät und darin durchgeführte verfahren Download PDF

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Publication number
EP3192204B1
EP3192204B1 EP15771293.6A EP15771293A EP3192204B1 EP 3192204 B1 EP3192204 B1 EP 3192204B1 EP 15771293 A EP15771293 A EP 15771293A EP 3192204 B1 EP3192204 B1 EP 3192204B1
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Prior art keywords
communication terminal
cell
data channel
radio access
access node
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EP15771293.6A
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English (en)
French (fr)
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EP3192204B8 (de
EP3192204A1 (de
Inventor
Mattias Frenne
Jung-Fu Cheng
Daniel Chen LARSSON
Havish Koorapaty
Sorour Falahati
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Priority to PL19214789T priority Critical patent/PL3641210T3/pl
Priority to EP19214789.0A priority patent/EP3641210B1/de
Priority to EP21205812.7A priority patent/EP3968561B1/de
Publication of EP3192204A1 publication Critical patent/EP3192204A1/de
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Publication of EP3192204B1 publication Critical patent/EP3192204B1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers

Definitions

  • the disclosure herein relates to a radio access node, a communication terminal and methods performed therein.
  • the disclosure herein relates to scheduling a control channel and/or a data channel to a communication terminal.
  • a Radio Access Network In a typical wireless communication network, communication terminals, also known as wireless devices and/or user equipments (UEs), communicate via a Radio Access Network (RAN) to one or more core networks.
  • the RAN covers a geographical area which is divided into cell areas, with each cell area being served by a radio access node such as a base station, e.g., a radio base station (RBS), which in some networks may also be called, for example, a "NodeB" or "eNodeB".
  • a cell is a geographical area where radio coverage is provided by the radio base station at a base station site or an antenna site in case the antenna and the radio base station are not co-located. Each cell is identified by an identity within the local radio area, which is broadcast in the cell.
  • One radio access node may have one or more cells.
  • the radio access nodes communicate over the air interface operating on radio frequencies with the communication terminals within range of the radio access nodes with downlink transmissions towards the communication terminals and uplink transmission from the communication terminals.
  • a Universal Mobile Telecommunications System is a third generation wireless communication system, which evolved from the second generation (2G) Global System for Mobile Communications (GSM).
  • the UMTS terrestrial radio access network (UTRAN) is essentially a RAN using wideband code division multiple access (WCDMA) and/or High Speed Packet Access (HSPA) for wireless devices.
  • WCDMA wideband code division multiple access
  • HSPA High Speed Packet Access
  • 3GPP Third Generation Partnership Project
  • telecommunications suppliers propose and agree upon standards for third generation networks and UTRAN specifically, and investigate enhanced data rate and radio capacity.
  • 3GPP Third Generation Partnership Project
  • radio access nodes may be connected, e.g., by landlines or microwave, to a controller node, such as a radio network controller (RNC) or a base station controller (BSC), which supervises and coordinates various activities of the plural base stations connected thereto.
  • RNC radio network controller
  • BSC base station controller
  • the RNCs are typically connected to one or more core networks.
  • the Evolved Packet System comprises the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), also known as the Long Term Evolution (LTE) radio access, and the Evolved Packet Core (EPC), also known as System Architecture Evolution (SAE) core network.
  • E-UTRAN/LTE is a variant of a 3GPP radio access technology wherein the radio access nodes are directly connected to the EPC core network rather than to RNCs.
  • the functions of a RNC are distributed between the radio access nodes, e.g. eNodeBs in LTE, and the core network.
  • the Radio Access Network (RAN) of an EPS has an essentially "flat" architecture comprising radio access nodes without reporting to RNCs.
  • LAA Liense Assisted Access
  • PCell primary cell
  • SCell secondary cell
  • LTE frame timing in the primary cell is simultaneously used in the secondary cell.
  • the unlicensed spectrum is mainly used by communication terminals implementing the IEEE 802.11 Wireless Local Area Network (WLAN) standard. This standard is known under its marketing brand “Wi-Fi.”
  • WLAN Wireless Local Area Network
  • IEEE 802.11 equipment also called WLAN equipment, uses a contention based medium access scheme. This scheme does not allow a wireless medium to be reserved at specific instances of time. Instead, IEEE 802.11 equipment or IEEE 802.11 compliant devices only support the immediate reservation of the wireless medium following the transmission of at least one medium reservation message, e.g. Request to Send (RTS) or Clear to Send (CTS) or others.
  • RTS Request to Send
  • CTS Clear to Send
  • the LAA system transmits at least one of the aforementioned medium reservation messages to block surrounding IEEE 802.11 equipment from accessing the wireless medium.
  • LTE uses Orthogonal Frequency-Division Multiplexing (OFDM) in the downlink (DL) and Discrete Fourier Transform (DFT)-spread OFDM in the uplink (UL).
  • OFDM Orthogonal Frequency-Division Multiplexing
  • DFT Discrete Fourier Transform
  • a basic LTE downlink physical resource may thus be seen as a time-frequency grid as illustrated in Figure 1 , where each Resource Element (RE) corresponds to one OFDM subcarrier during one OFDM symbol interval.
  • a symbol interval comprises a cyclic prefix (cp), which cp is a prefixing of a symbol with a repetition of the end of the symbol to act as a guard band between symbols and/or facilitate frequency domain processing.
  • Frequencies for subcarriers having a subcarrier spacing ⁇ f are defined along an z-axis and symbols are defined along an x-axis.
  • the resource allocation in LTE is typically described in terms of resource blocks, where a resource block corresponds to one slot of 0.5 ms in the time domain and 12 subcarriers in the frequency domain.
  • a pair of two adjacent resource blocks in time direction covering 1.0 ms, is known as a resource block pair.
  • Resource blocks are numbered in the frequency domain, starting with resource block 0 from one end of the system bandwidth.
  • one subframe consists of 14 OFDM symbols. The duration of each OFDM symbol is approximately 71.4 ⁇ s.
  • Downlink and uplink transmissions are dynamically scheduled, i.e. in each subframe the radio access node transmits control information about to or from which communication terminal data is transmitted and upon which resource blocks the data is transmitted, in the current downlink subframe.
  • the control region may comprise many PDCCH carrying control information to multiple communication terminals simultaneously.
  • the resource elements used for control signaling are indicated with wave-formed lines and resource elements used for reference symbols are indicated with diagonal lines.
  • Frequencies f or subcarriers are defined along a z-axis and symbols are defined along an x-axis.
  • the downlink subframe also contains common reference symbols, which are known to the receiver and used for channel estimation for coherent demodulation of e.g. the control information.
  • the reference symbols shown in the Figure 3 are the Cell specific Reference Symbols (CRS) and are used to support multiple functions including fine time and frequency synchronization and channel estimation for certain transmission modes.
  • CRS Cell specific Reference Symbols
  • a wireless communication network there is a need to measure the channel conditions in order to know what transmission parameters to use. These parameters include, e.g., modulation type, coding rate, transmission rank, and frequency allocation. This applies to uplink (UL) as well as downlink (DL) transmissions.
  • the scheduler that makes the decisions on the transmission parameters is typically located in the radio access node e.g. the base station (eNB).
  • the radio access node can measure channel properties of the UL directly using known reference signals that the communication terminals transmit. These measurements then form a basis for the UL scheduling decisions that the radio access node makes, which are then sent to the communication terminals via a downlink control channel.
  • CSI Channel-State Information
  • CSI-RS Channel-State Information Reference Symbols
  • the PDCCH/EPDCCH is used to carry Downlink Control Information (DCI) in a DCI message such as scheduling decisions and power-control commands. More specifically, the DCI comprises:
  • One PDCCH/EPDCCH carries one DCI message containing one of the groups of information listed above.
  • multiple communication terminals may be scheduled simultaneously, and each communication terminal can be scheduled on both downlink and uplink simultaneously, there must be a possibility to transmit multiple scheduling messages within each subframe.
  • Each scheduling message is transmitted on separate PDCCH/EPDCCH resources, and consequently there are typically multiple simultaneous PDCCH/EPDCCH transmissions within each subframe in each cell.
  • link adaptation may be used, where the code rate of the PDCCH/EPDCCH is selected by adapting the resource usage for the PDCCH/EPDCCH, to match the radio-channel conditions.
  • the OFDM symbols in a first slot are numbered from 0 to 6.
  • the starting OFDM symbol in the first slot of the subframe for EPDCCH can be configured by higher layer signaling and the same starting OFDM symbol is in this case used for the corresponding scheduled PDSCH. Both sets have the same EPDCCH starting symbol for these transmission modes. If not configured by higher layers, the starting OFDM symbol for both PDSCH and EPDCCH is given by the CFI value signalled in Physical Control Format Indicator Channel (PCFICH).
  • PCFICH Physical Control Format Indicator Channel
  • Multiple starting OFDM symbol candidates may be achieved by configuring the communication terminal in transmission mode 10, by having multiple EPDCCH Physical Resource Block (PRB) configuration sets where for each set the starting OFDM symbol in the first slot in a subframe for EPDCCH can be configured by higher layers to be a value from ⁇ 1,2,3,4 ⁇ , independently for each EPDCCH set. If a set is not higher layer configured to have a fixed starting OFDM symbol, then the EPDCCH starting OFDM symbol for this set follows the CFI value received in PCFICH.
  • PRB Physical Resource Block
  • the starting OFDM symbol in the first slot of a subframe for PDSCH is dynamically signaled in the DCI message to the communication terminal using two "PDSCH Resource Element (RE) Mapping and QCL Indicator", PQI for short, bits in the DCI format 2D.
  • RE Resource Element
  • QCL Indicator QCL Indicator
  • Up to four possible OFDM start values is thus possible to signal to the communication terminal and the OFDM start values may be taken from the set ⁇ 1,2,3,4 ⁇ .
  • Which OFDM start value each of the four states of the PQI bits represents, is configured by Radio Resource Control (RRC) signaling to the communication terminal.
  • RRC Radio Resource Control
  • the starting OFDM symbol for each of the two EPDCCH sets re-use the PDSCH start symbol of a PQI state configured for PDSCH to the communication terminal.
  • these EPDCCH start symbols are not dynamically varying, in which case they would have been varying from subframe to subframe, but are semi-statically configured by higher layer signaling, and taken from the higher layer configured parameters related to the PQI states.
  • EPDCCH set 1 and 2 can only start at either OFDM symbol 1 or 2 in this example since these are the start values used for PDSCH.
  • Which one is used for each EPDCCH set is also conveyed by RRC signaling to the communication terminal when configuring the EPDCCH parameters.
  • EPDCCH set 1 use start symbol 1 and EPDCCH set 2 use start symbol 2 in this non-limiting example.
  • start symbols for each EPDCCH set is fixed until it is re-configured in a RRC re-configuration whereas a PDSCH scheduled from any of the two EPDCCH sets can be signaled dynamically to start at either symbol 1 or 2, using the PQI bits.
  • LTE Rel-10 supports bandwidths larger than 20 MHz.
  • One important requirement on LTE Rel-10 is to assure backward compatibility with LTE Rel-8. This should also include spectrum compatibility. That would imply that an LTE Rel-10 carrier, wider than 20 MHz, should appear as a number of LTE carriers to an LTE Rel-8 terminal. Each such carrier can be referred to as a Component Carrier (CC).
  • CC Component Carrier
  • CA Carrier Aggregation
  • the number of aggregated CC as well as the bandwidth of the individual CC may be different for uplink and downlink.
  • a symmetric configuration refers to the case where the number of CCs in downlink and uplink is the same whereas an asymmetric configuration refers to the case where the number of CCs is different between UL and DL. It is important to note that the number of CCs configured in a cell may be different from the number of CCs seen by a communication terminal. For example, a communication terminal may support more downlink CCs than uplink CCs, even though the cell is configured with the same number of uplink and downlink CCs.
  • Scheduling of a CC is done on the PDCCH or EPDCCH via downlink assignments.
  • Control information on the PDCCH/EPDCCH is formatted as a Downlink Control Information (DCI) message.
  • DCI Downlink Control Information
  • a communication terminal only operates with one DL and one UL CC. The association between DL assignment, UL grants and the corresponding DL and UL CCs is therefore clear.
  • two modes of CA needs to be distinguished.
  • a first case is very similar to the operation of multiple Rel-8 communication terminals, a DL assignment or UL grant contained in a DCI message transmitted on a CC is either valid for the DL CC itself or for an associated, either via cell-specific or communication terminal specific linking, UL CC.
  • a second mode of operation augments a DCI message with a Carrier Indicator Field (CIF).
  • CIF Carrier Indicator Field
  • a DCI message containing a DL assignment with CIF is valid for the indicated DL CC and a DCI message containing an UL grant with CIF is valid for the indicated UL CC.
  • the DCI message transmitted using EPDCCH which was introduced in Rel-11 can also carry CIF which means that cross-carrier scheduling is supported also when using EPDCCH.
  • Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) is used. This means that the channel is sensed, and only if the channel is declared as Idle, a transmission is initiated. In case the channel is declared as Busy, the transmission is essentially deferred until the channel is found Idle.
  • CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
  • FIG. 5 A general illustration of the LBT mechanism is shown in Figure 5 .
  • the radio access node performs Clear Channel Assessment (CCA) using energy detection of a wireless channel. Traffic is not detected during the first time interval T 1 , T 1 ⁇ 20 ⁇ s.
  • CCA Clear Channel Assessment
  • the radio access node then occupies the wireless channel and starts data transmission over a second time interval T 2 .
  • the second time interval may be in the range of 1ms to 10ms.
  • the radio access node may then send control (CTRL) signals without performing a CCA check over a fifth time interval T 5 because the channel has already been occupied by the radio access node for the data transmission.
  • CCA Clear Channel Assessment
  • the radio access node remains idle, meaning that the radio access node does not transmit on the wireless channel.
  • the radio access node performs CCA and detects that the channel is being used for other traffic.
  • a fourth time interval T 4 being defined as T 2 +T 3 the radio access node is prohibited to transmit on the wireless channel, as it was found to be occupied by other traffic.
  • the radio access node starts a CCA at the end of the prohibited time T 4 .
  • the radio access node performs CCA using energy detection at the end of the fourth time interval T 4 . As the CCA indicates that the wireless channel is free, the radio access node may occupy the channel and start a data transmission.
  • LTE the spectrum used by LTE is dedicated to LTE. This has the advantage that LTE system does not need to care about the coexistence issue and the spectrum efficiency can be maximized.
  • the spectrum allocated to LTE is limited which cannot meet the ever increasing demand for larger throughput from applications/services. Therefore, discussions are ongoing in 3GPP to initiate a new study item on extending LTE to exploit unlicensed spectrum in addition to licensed spectrum. Unlicensed spectrum can, by definition, be simultaneously used by multiple different technologies. Therefore, LTE needs to consider the coexistence issue with other systems such as IEEE 802.11 (Wi-Fi). Operating LTE in the same manner in unlicensed spectrum as in licensed spectrum can seriously degrade the performance of Wi-Fi as Wi-Fi will not transmit once it detects that the channel is occupied.
  • Wi-Fi IEEE 802.11
  • one way to utilize the unlicensed spectrum reliably is to transmit essential control signals and channels on a licensed carrier. That is, as shown in Figure 6 , a communication terminal is connected to a PCell in the licensed band or spectrum and one or more SCells in the unlicensed band or spectrum.
  • a secondary cell in unlicensed spectrum is herein denoted as license assisted secondary cell (LA SCell).
  • LA SCell license assisted secondary cell
  • the network Prior to occupying a channel in an unlicensed band, the network needs to check the availability of the channel by means of LBT. When the network has already accessed a channel, it may, in the following and adjacent transmission time interval, start transmission immediately, e.g. from symbol 0, without performing LBT.
  • LBT Low-power Bluetooth
  • data transmissions to the communication terminal are scheduled on the carrier where LBT needs to be used.
  • This is denoted cross-carrier scheduling.
  • Whether LBT is used in a subframe is a network, or radio access node, decision. It is thus a problem how the communication terminal will know whether the radio access node is performing LBT or not, since it impacts the mapping of EPDCCH and PDSCH modulated symbols to resource elements.
  • LBT When LBT is performed, the network cannot transmit, and if the channel is unoccupied, the data transmission can start only after the LBT period.
  • transmission may, as mentioned above, start immediately in the following and adjacent transmission time interval or subframe.
  • the starting OFDM symbol for data is different depending on whether LBT is performed or not. If the starting OFDM symbol is unknown at the communication terminal, the communication terminal is unable to receive messages. This will lead to a limited performance of the wireless communications network.
  • US20140112289 discloses a system using a reservation signal if it is determined that the unlicensed band is available.
  • An object of embodiments herein is to provide a mechanism that improves the performance of the wireless communications network when implementing usage of a telecommunication technology into an unlicensed spectrum e.g. where LBT is used.
  • a method performed by a communication terminal for handling communication is provided.
  • the communication terminal is served by a radio access node in a first cell on a carrier of a licensed frequency spectrum and cross-carrier scheduled in a second cell on a carrier of an unlicensed frequency spectrum by the radio access node via the first cell.
  • the communication terminal receives an indication that data may be scheduled for the communication terminal on a data channel in the
  • the communication terminal attempts to detect presence of the data channel intended for the communication terminal. In case the communication terminal detects presence of the data channel intended for the communication terminal, the communication terminal decodes the data channel; and in case the communication terminal does not detect presence of the data channel intended for the communication terminal, the communication terminal indicates a non-detection of the data channel to the radio access node.
  • a method performed by a radio access node for handling communication with a communication terminal in a second cell on a carrier of an unlicensed frequency spectrum wherein resources for communication with the communication terminal in the second cell are cross-carrier scheduled from a first cell on a carrier of a licensed frequency spectrum.
  • the radio access node transmits an indication that data may be scheduled for the communication terminal on a data channel in the second cell.
  • a communication terminal for handling communication is provided.
  • the communication terminal is configured to communicate with a radio access node in a first cell on a carrier of a licensed frequency spectrum and to be cross-carrier scheduled in a second cell on a carrier of an unlicensed frequency spectrum by the radio access node via the first cell.
  • the communication terminal is configured to receive an indication that data may be scheduled for the communication terminal on a data channel in the second cell.
  • the communication terminal is further configured to attempt to detect presence of the data channel intended for the communication terminal.
  • the communication terminal In case the communication terminal detects presence of the data channel intended for the communication terminal, the communication terminal is configured to decode the data channel, and in case the communication terminal does not detect presence of the data channel intended for the communication terminal, the communication terminal is configured to indicate a non-detection of the data channel to the radio access node.
  • a radio access node for handling communication with a communication terminal.
  • the radio access node is configured to communicate with the communication terminal in a second cell on a carrier of an unlicensed frequency spectrum, wherein resources for communication with the communication terminal in the second cell are cross-carrier scheduled from a first cell on a carrier of a licensed frequency spectrum.
  • the radio access node is configured to transmit an indication that data may be scheduled for the communication terminal on a data channel in the second cell.
  • the communication terminal By attempting to detect presence of the data channel the communication terminal will be able to more reliably receive data transmitted on the second cell also when the transmission is deferred due to that LBT must be performed before the transmission can be made. Thereby the performance of the wireless communication network is improved.
  • Fig. 7a is a schematic overview depicting a wireless communication network 1.
  • the wireless communication network 1 comprises one or more RANs and one or more CNs.
  • the wireless communication network 1 may use a number of different technologies, such as Long Term Evolution (LTE), LTE-Advanced, Wideband Code Division Multiple Access (WCDMA), Global System for Mobile communications/Enhanced Data rate for GSM Evolution (GSM/EDGE), Worldwide Interoperability for Microwave Access (WiMax), or Ultra Mobile Broadband (UMB), just to mention a few possible implementations.
  • LTE Long Term Evolution
  • WCDMA Wideband Code Division Multiple Access
  • GSM/EDGE Global System for Mobile communications/Enhanced Data rate for GSM Evolution
  • WiMax Worldwide Interoperability for Microwave Access
  • UMB Ultra Mobile Broadband
  • the wireless communication network 1 is exemplified herein as an LTE network.
  • a communication terminal 10 also known as a wireless device, a user equipment and/or a wireless terminal, communicates via a Radio Access Network (RAN) to one or more core networks (CN).
  • RAN Radio Access Network
  • CN core networks
  • “communication terminal” is a non-limiting term which means any wireless terminal, user equipment, Machine Type Communication (MTC) device, a Device to Device (D2D) terminal, or node e.g. smartphone, laptop, mobile, sensor, relay, mobile tablets or even a small base station communicating within a cell.
  • MTC Machine Type Communication
  • D2D Device to Device
  • Communication terminals connect in a licensed spectrum, to a first cell 11 e.g. a Primary Cell (PCell), and use carrier aggregation to benefit from additional transmission capacity in an unlicensed spectrum, whereby they connect to a second cell 14 e.g. a Secondary Cell (SCell) also referred to as Licensed Assisted (LA) SCell.
  • a frame timing in the first cell 11 is simultaneously used in the second cell 14.
  • the wireless communication network 1 covers a geographical area which is divided into cell areas, e.g. the first cell 11 and the second cell 14.
  • the second cell 14 is served by a second radio access node 12 providing radio coverage over the second cell 14.
  • the first cell 11 may also be served by the second radio access node 12 but in the illustrated examples herein the first cell 11 is being served by a first radio access node 13.
  • the radio access nodes may be radio base stations such as NodeBs, evolved Node Bs (eNB, eNode B), Wi-Fi access point base transceiver stations, Access Point Base Stations, base station routers, or any other network units capable of communicating with a communication terminal within the cell served by the respective radio access node depending e.g. on the radio access technology and terminology used.
  • the radio access nodes may serve one or more cells.
  • a cell is a geographical area where radio coverage is provided by radio base station equipment at a base station site or at remote locations in Remote Radio Units (RRU).
  • RRU Remote Radio Units
  • the cell definition may also incorporate frequency bands and radio access technology used for transmissions, which means that two different cells may cover the same geographical area but use different frequency bands.
  • the radio access nodes communicate over the air or radio interface operating on radio frequencies with the communication terminal 10 within range of the respective radio access node.
  • the communication terminal 10 transmits data over the radio interface to the respective radio access node in Uplink (UL) transmissions and the respective radio access node transmits data over an air or radio interface to the communication terminal 10 in Downlink (DL) transmissions.
  • UL Uplink
  • DL Downlink
  • the second radio access node 12 serving the second cell 14 uses a carrier of an unlicensed frequency spectrum, which unlicensed frequency spectrum may also be used by an access point 15 such as a WiFi modem, a hotspot or similar. Since the unlicensed frequency spectrum must be shared with other communication terminals or radio access node, potentially operating according to other radio standards such as IEEE 802.11n, of similar or dissimilar wireless technologies, a so called Listen-Before-Talk (LBT) method may need to be applied. Thus, the second radio access node 12 may use an LBT process before transmitting to the communication terminal 10. In embodiments herein cross-carrier scheduling is performed wherein data channels such as PDSCH and PUSCH are cross-carrier scheduled.
  • LBT Listen-Before-Talk
  • a control channel such as the EPDCCH or PDCCH transmitted on the first cell 11 schedules the data to be transmitted on the second cell 14 in a cross-carrier manner.
  • Embodiments herein describe how to enable the communication terminal 10 to detect the PDSCH e.g. blindly or automatically and how to inform the radio access node, such as the first radio access node 13, that the communication terminal 10 has detected or not detected the PDSCH.
  • the problem of mismatch between radio access node and communication terminal in transmission time due to LBT is solved by the communication terminal detecting presence of the PDSCH.
  • the detection may be made autonomously by the communication terminal.
  • a set of communication terminal and radio access node behaviors if the communication terminal detects the presence of the PDSCH are specified herein.
  • Embodiments herein describe how to enable the communication terminal to detect the PDSCH and how to inform the radio access node that the communication terminal has detected the PDSCH.
  • LBT on an unlicensed carrier may result in deciding not to transmit an PDSCH although this has been scheduled by the first radio access node 13.
  • the second radio access node 12 will perform LBT and if the channel on the unlicensed carrier, i. e. the channel on the carrier of the unlicensed frequency spectrum, is considered or determined to be free the second radio access node 12 will transmit a PDSCH to the communication terminal 10 according to the previously sent DL assignment on the first cell 11.
  • the communication terminal 10 may blindly detect presence of the PDSCH on the second cell 14 and based on if the communication terminal detects it or not the communication terminal 10 tries to decode it. Further based on detection of presence of the PDSCH or not on the second cell 14, the communication terminal may indicate different HARQ feedback states on the first cell 11, or to the first radio access node 13.
  • Fig. 7b is a schematic flowchart depicting the method performed by the communication terminal 10 for handling communication, which communication terminal 10 is being served by a radio access node of the wireless communication network, such as the first radio access node 13 or second radio access node 12, in the first cell 11 on a carrier of the licensed frequency spectrum and cross-carrier scheduled in the second cell 14 on a carrier of the unlicensed frequency spectrum by the radio access node via the first cell 11.
  • the method may for example be used for handling communication with one or more radio access nodes on one or more carriers of the unlicensed frequency spectrum within the wireless communication network 1.
  • the communication terminal 10 may in some embodiments receive on the first cell, a New Data Indicator, NDI, bit.
  • the NDI bit may indicate how to indicate that the communication terminal 10 has received the scheduling DCI message but not received the data channel associated with the scheduling DCI message.
  • the communication terminal 10 receives an indication that data may be scheduled for the communication terminal 10 on a data channel in the second cell 14.
  • the communication terminal 10 may receive a reference signal on the second cell 14 that indicates to the communication terminal 10 that the carrier of the unlicensed frequency spectrum has been occupied by the second cell 14.
  • the reference signal may in some embodiments further indicate to the communication terminal 10 whether the data channel is present in a subframe or not.
  • the reference signal may be common for all communication terminals operating on the second cell 14.
  • the reference signal may be specific to the communication terminal 10. In this case the reference signal may be located within the data channel.
  • the communication terminal 10 may receive , on the first cell 11, control information for the second cell 14.
  • the control information indicates where in a subframe the data channel is scheduled in the second cell 14 for the communication terminal 10.
  • the communication terminal 10 attempts to detect presence of the data channel intended for the communication terminal 10.
  • the communication terminal 10 may in some embodiments attempt to detect the data channel in the subframe as indicated by the control information received on the first cell 11 in Action 712.
  • the communication terminal 10 may attempt to detect the data channel in a subframe as indicated by the reference signal received on the second cell in Action 712.
  • the communication terminal 10 may attempt to detect the data channel in the subframe comprising the control information and/or in a separate subframe that may follow after the subframe comprising the control information.
  • the communication terminal 10 may detect, or attempt to detect, presence of the data channel blindly.
  • the communication terminal 10 may attempt to detect presence of the data channel by correlating received reference signal sequences with a set of known sequences, and when the correlation is above a threshold for matching, the presence of the data channel intended for the communication terminal 10 is considered detected.
  • the communication terminal 10 may attempt to detect the data channel by searching for a DMRS on scheduled Physical Resource Blocks, PRBs. Based on an outcome of the search, the communication terminal 10 may judge whether or not the data channel intended for the communication terminal 10 is scheduled in the PRBs. In further embodiments, where the data on the data channel may be scheduled with a Cell Specific Reference Signal (CRS) based transmission scheme, the communication terminal 10 may attempt to detect the data channel by validating allocated Physical Resource Blocks, PRBs.
  • CRS Cell Specific Reference Signal
  • the communication terminal 10 determines the data channel to be detected, and if the allocated PRBs are not consistent with the information given in the scheduling DCI message, the communication terminal 10 determines the data channel not to be present.
  • Action 714 In case the communication terminal 10 detects presence of the data channel intended for the communication terminal 10, the communication terminal 10 decodes the data channel.
  • Action 715 In case the communication terminal 10 does not detect presence of the data channel intended for the communication terminal 10, the communication terminal 10 indicates a non-detection of the data channel to the radio access node 12, 13.
  • the communication terminal 10 may indicate a non-detection by transmitting a Non-Acknowledgement, NACK, or Discontinuous Transmission, DTX, state, on the first cell 11.
  • the communication terminal 10 may further indicate a non-detection of the data channel by indicating on the first cell 11 that the communication terminal 10 has received a scheduling DCI message but not received the data channel associated with the scheduling DCI message.
  • the communication terminal 10 may reset an hybrid automatic request process when the data channel is detected and corresponds to information in the scheduling DCI message; or independently of whether the data channel is detected or not.
  • Fig. 7c is a schematic flowchart depicting the method performed by the radio access node such as the first radio access node 13 or the second radio access node 12 for handling communication with the communication terminal 10 in the second cell 14 on a carrier of the unlicensed frequency spectrum, wherein resources for communication with the communication terminal 10 in the second cell 14 are cross-carrier scheduled from the first cell 11 on a carrier of the licensed frequency spectrum.
  • the method may for example be used for handling communication with the communication terminal on one or more carriers of the unlicensed frequency spectrum within the wireless communication network 1.
  • the radio access node may transmit to the communication terminal 10 on the first cell 11, the NDI bit, which NDI bit indicates how to indicate that the communication terminal 10 has received the scheduling DCI message but not received the data channel associated to the scheduling DCI message.
  • the radio access node transmits the indication that data may be scheduled for the communication terminal 10 on a data channel in the second cell 14.
  • the radio access node may transmit the indication that data may be scheduled for the communication terminal 10 by transmitting a reference signal on the second cell 14 that indicates to the communication terminal 10 that the carrier of the unlicensed frequency spectrum has been occupied by the second cell 14.
  • the reference signal may in some embodiments further indicate to the communication terminal 10 whether the data channel is present in a subframe transmitted on the second cell 14 or not.
  • the reference signal may be common for all communication terminals operating on the second cell 14.
  • the reference signal may be specific to the communication terminal 10. In this case the reference signal may be located within the data channel.
  • the radio access node may transmit the indication that data may be scheduled for the communication terminal 10 by transmitting, on scheduled PRBs, a DMRS with a modified pattern that indicates presence of the data channel to the communication terminal 10.
  • the radio access node may transmit the indication that data may be scheduled for the communication terminal 10 by transmitting an extra detection RS on the second cell 14 when the carrier of the unlicensed frequency spectrum is occupied by the second cell 14, and wherein the extra detection RS is changes form or state to indicate to the communication terminal 10 that the data channel is present.
  • the radio access node may perform a Listen Before Talk (LBT) process on the carrier of the unlicensed spectrum before transmitting, on the second cell 14, any indication that data may be scheduled for the communication terminal 10, and transmitting the indication only when the outcome of the LBT process is that the carrier of the unlicensed frequency spectrum is free.
  • LBT Listen Before Talk
  • the radio access node is configured to serve the communication terminal 10 in the first cell 11 and to cross-carrier schedule resources for the communication terminal 10 in the second cell 14 via the first cell 11.
  • the radio access node may then, alternatively of additionally, transmit the indication that data may be scheduled for the communication terminal 10 by transmitting, on the first cell 11, control information for the second cell 14 to the communication terminal 10, which control information indicates where in a subframe the data channel is scheduled in the second cell 14 for the communication terminal 10.
  • the radio access node may then receive an indication that the communication terminal 10 has not received the data on the data channel scheduled in the second cell 14.
  • the indication may in one example be received on the first cell 11.
  • the received indication may be a NACK or DTX response from the communication terminal 10 or that the radio access node does not detect any Hybrid Automatic Repeat Request, HARQ , response, for example on the first cell 11, from the communication terminal 10 although the data channel has been transmitted to the communication terminal 10 on the second cell 14.
  • the received indication may further indicate that the communication terminal 10 has received a scheduling DCI message but not received the data channel associated to the scheduling DCI message.
  • the radio access node may further reschedule the data on the data channel, or adjust the data channel, based on the received indication. For example, the radio access node may schedule a same redundancy version for re-transmission as used for transmission of the data in order to improve reception of a transport block in the communication terminal 10 in that the transport block is repeatedly transmitted until confirmed received.
  • Fig. 8 is a combined flowchart and signaling scheme according to exemplified embodiments herein, wherein the first radio access node 13 performs cross carrier scheduling for the radio access node 12.
  • data and/or scheduling information e.g. DCI
  • the first radio access node 13 schedules the communication terminal 10 with control information using PDCCH.
  • the first radio access node 13 or a scheduler in the first radio access node 13 may also take into account which PDSCH resources that are available in the second cell 14. So the scheduler in the first radio access node 13 may have knowledge also about decisions made by a scheduler operating in the second radio access node 12. For instance, there could be a scheduler in the second radio access node 12 scheduling communication terminals supporting EPDCCH, i.e. terminals that do not need to be cross-carrier scheduled for PDSCH, but also scheduling communication terminals for data transmissions, PDSCH, not supporting EPDCCH that must be cross-carrier scheduled with control information, PDCCH, from first radio access node 13.
  • the first radio access node 13 or the scheduler in the first radio access node 13 may be cooperating with the second radio access node 12 or a scheduler in the second radio access node 12, or there may be a joint scheduler.
  • the scheduling information of the PDSCH may be obtained from the second radio access node 12 as indicated by the double directed arrow.
  • the first radio access node 13 transmits control information such as DCI to the communication terminal 10 as scheduled.
  • the first radio access node 13 schedules the communication terminal 10 with PDCCH in a cross-carrier manner before knowing whether the channel on the Scell, i.e. on the second cell 14 is free or not. Note that the transmission of this control information or scheduling message performed in action 803 may take place simultaneously as the LBT is performed by the second radio access node 12, action 804 below.
  • the first radio access node 13 may in some embodiments schedule the communication terminal 10 with multiple different DL assignments such that the DL assignments may have different starting OFDM symbols.
  • the communication terminal 10 may then in one example make one attempt to detect PDSCH per starting OFDM symbol candidate. Depending on when the second radio access node 12 detects the channel to be free one of the DL assignments having a suitable starting OFDM symbol may then be applicable.
  • a PQI indicator in the DCI message indicates a starting OFDM symbol for the mapping of the PDSCH that is located after LBT has been performed on the unlicensed carrier, i.e. the second cell 14. It may further be so that there are multiple PQI indicators in the same DL assignment, i.e. indicating multiple starting OFDM symbols to the communication terminal 10.
  • the following single PDSCH that is sent to the communication terminal 10 can only be sent if the channel on the carrier is considered or determined to be free.
  • the second radio access node 12 performs a LBT process and listens to the carrier of the unlicensed frequency spectrum. The second radio access node 12 will determine if the channel is free based on LBT on that carrier. In case it is not free, the PDSCH cannot be transmitted, despite the fact that the scheduling message has already been transmitted to the communication terminal 10. However there are several options for how to indicate to the communication terminal 10 whether there is actually any PDSCH located there or not. Some options for such indications are further outlined below.
  • the second radio access node 12 may transmit data on the PDSCH in case the channel is free.
  • the communication terminal 10 tries to blindly detect the presence of PDSCH intended for the communication terminal 10.
  • the communication terminal 10 detects the presence of PDSCH intended for the communication terminal 10 and then decodes the PDSCH.
  • Action 808 If the communication terminal 10 does not detect presence of the PDSCH in action 806, there are several different possible communication terminal behaviors for the communication terminal 10 to indicate that it has not detected the PDSCH.
  • the first radio access node 13 indicates a New Data Indicator (NDI) bit in the scheduling DCI format or message, there are different possible communication terminal behaviors:
  • the HARQ feedback reported from the communication terminal 10 could also differ depending on if the NDI bit is flipped or toggled, i.e. '0' to '1' or'1' to '0' with respect to a previous received DCI message, or not. If the NDI bit is not flipped the communication terminal 10 could for example report either NACK or DTX or nothing for the specific HARQ process if no PDSCH is detected, whereas if the NDI bit is flipped, the communication terminal 10 may indicate to the network, e.g. to the first radio access node 13, that it has not detected a PDSCH corresponding to the scheduling DCI message.
  • Fig. 9 is a schematic flowchart depicting a method performed by a radio access node according to some embodiments herein.
  • the radio access node e.g. the first radio access node 13, being configured for cross-carrier scheduling of resources for the communication terminal in the second cell 14.
  • the radio access node may transmit control information to the communication terminal, which control information indicates where data is scheduled in the second cell 14.
  • the radio access node may receives the indication that the communication terminal has not received the data. E.g., the radio access node may receive a NACK from the communication terminal 10 or it may not receive any response from the communication terminal 10.
  • the radio access node may then adjust or re-schedule the data transmission based on the received indication.
  • Fig. 10 is a schematic flowchart depicting a method performed by the communication terminal 10 according to some embodiments herein.
  • the communication terminal 10 is served by a radio access node, e.g. the first radio access node 13, in the first cell 11 of a licensed frequency spectrum and by a different radio access node, e.g. second radio access node 12, in the second cell 14 of an unlicensed frequency spectrum.
  • the communication terminal 10 is scheduled in or on the second cell 14 by the radio access node serving the first cell 11, i.e. cross-carrier scheduled in the second cell 14 by the first radio access node 13.
  • the communication terminal 10 may receive, from the first radio access node 13, control information, scheduling information or DCI of the second cell 14, which control information indicates where in a subframe data, PDSCH, is scheduled in the second cell 14.
  • the communication terminal 10 detects, e.g. independently of the received control information, a presence of PDSCH, intended for the communication terminal 10 by comparing reference signals in a received transmission from the second radio access node 12. Thus, the communication terminal 10 may detect presence of the data channel leading to an improved performance of the wireless communication network 1.
  • Action 103 In case the communication terminal 10 detects presence of PDSCH intended for the communication terminal 10, the communication terminal 10 decodes the data channel such as PDSCH.
  • Action 104 In case control information indicates scheduling of PDSCH but the communication terminal 10 does not detect the presence of PDSCH intended for the communication terminal 10, the communication terminal 10 indicates a non-detection of PDSCH to e.g. the first radio access node 13.
  • a radio access node 100 is provided, exemplified above as the first radio access node 13. The description in the following is however equally applicable to the second radio access node 12.
  • Fig. 11 is a block diagram depicting the radio access node 100 for handling communication with the communication terminal 10 according to embodiments herein. Handling herein means enabling communication and/or scheduling resources for communication for the communication terminal 10. The radio access node 100 is configured for cross-carrier scheduling of resources for the communication terminal 10 in the second cell 14.
  • the radio access node 100 for handling communication with the communication terminal 10 in the second cell on the carrier of the unlicensed frequency spectrum is herein provided.
  • Resources for communication with the communication terminal (10) in the second cell (14) are cross carrier scheduled from the first cell on the carrier of the licensed frequency spectrum.
  • the radio access node 100 is configured to transmit the indication that data may be scheduled for the communication terminal 10 on the data channel in the second cell 14.
  • the radio access node 100 may be configured to serve the communication terminal 10 in the second cell 14 of the unlicensed frequency spectrum.
  • the radio access node 100 may then be configured to transmit the indication by being configured to transmit the reference signal on the second cell 14 that indicates to the communication terminal 10 that the carrier of the unlicensed frequency spectrum has been occupied by the second cell 14.
  • the reference signal may in some embodiments further indicate to the communication terminal 10 whether the data channel is present in a subframe transmitted on the second cell 14 or not.
  • the reference signal may be common for all communication terminals operating on the second cell 14.
  • the reference signal may be specific to the communication terminal 10. In this case the reference signal may be located within the data channel.
  • the radio access node may be configured to serve the communication terminal 10 in the first and second cells 11,14 and the radio access node may be configured to transmit the indication that data may be scheduled for the communication terminal 10 by being configured to transmit, on the first cell 11, control information for the second cell 14, which control information indicates where in a subframe the data channel is scheduled in the second cell 14 for the communication terminal 10.
  • the data channel may be scheduled with the DMRS based transmission scheme and the radio access node 100 may be configured to transmit the indication that data may be scheduled for the communication terminal 10 by being configured to transmit a DMRS with a modified pattern on scheduled PRBs that indicates presence of the data channel to the communication terminal 10.
  • the radio access node 100 may further be configured to transmit the indication that data may be scheduled for the communication terminal 10 by being configured to transmit the extra detection RS on the second cell 14 when the carrier of the unlicensed frequency spectrum is occupied by the second cell 14.
  • the extra detection RS may change form or state to indicate to the communication terminal 10 that the data channel is present in a subframe.
  • the radio access node 100 may be further be configured to perform a Listen Before Talk, LBT, process on the carrier of the unlicensed spectrum and to transmit the indication only when the outcome of the LBT process is that the carrier of the unlicensed frequency spectrum is free.
  • LBT Listen Before Talk
  • the radio access node 100 is configured to serve the communication terminal 10 in the first cell 11 and to cross-carrier schedule resources for the communication terminal in the second cell 14 via the first cell 11.
  • the radio access node may then be configured to transmit the indication by being configured to transmit control information to the communication terminal 10, which control information indicates where in a subframe the data channel is scheduled in the second cell 14 for the communication terminal 10.
  • the radio access node 100 may then be configured to receive an indication that the communication terminal 10 has not received the data channel scheduled in the second cell.
  • the radio access node may further be configured to reschedule the data channel based on the received indication.
  • the received indication may be a NACK or DTX response from the communication terminal 10 or the received indication may be that the radio access node does to not detect any Hybrid Automatic Repeat Request, HARQ , response from the communication terminal 10 although the data channel is or has been transmitted on the second cell to the communication terminal 10.
  • the received indication may indicate that the communication terminal 10 has received the scheduling DCI message but not received the data channel associated to the scheduling DCI message.
  • the radio access node may be configured to reschedule the data channel by being configured to schedule a same redundancy version for re-transmission as used for transmission of the data in order to improve or optimize a reception of a transport block in the communication terminal 10.
  • the radio access node may be configured to transmit on the first cell 11 to the communication terminal 10, the NDI bit, which NDI bit indicates how to indicate that the communication terminal 10 has received a scheduling DCI message but not received the data channel associated to the scheduling DCI message.
  • the radio access node may be configured to serve the communication terminal in the first and/or second cell.
  • the radio access node may be the first radio access node 13 or the second radio access node 12, or a radio access node controlling the first and second cell.
  • the radio access node 100 is configured, e.g. by comprising a transmitting module 1101 , to transmit the indication that data may be scheduled for the communication terminal 10 on the data channel in the second cell 14.
  • Transmitting module 1101 may be configured to transmit the indication by being configured to transmit the reference signal on the second cell 14 that indicates to the communication terminal 10 that the carrier of the unlicensed frequency spectrum has been occupied by the second cell 14.
  • the reference signal may in some embodiments further indicate to the communication terminal 10 whether the data channel is present in a subframe transmitted on the second cell 14 or not.
  • the reference signal may be common for all communication terminals operating on the second cell 14.
  • the reference signal may be specific to the communication terminal 10. In this case the reference signal may be located within the data channel.
  • the transmitting module 1101 may be configured to transmit the indication by being configured to transmit, on the first cell 11, control information for the second cell 14 to the communication terminal 10, which control information indicates where data is scheduled, e.g. in a subframe, in the second cell 14.
  • the transmitting module 1101 may be configured to transmit the indication that data may be scheduled for the communication terminal 10 as stated above.
  • the transmitting module 1101 may be configured to transmit to the communication terminal 10, the NDI bit.
  • the radio access node 100 may further be configured, e.g. by comprising a receiving module 1102 , to receive an indication that the communication terminal 10 has not received the data.
  • the radio access node 100 may be configured to receive a NACK from the communication terminal 10 or to not receive any response from the communication terminal 10.
  • the receiving module 1102 may be configured to receive the indication that the communication terminal has not received the data channel scheduled to communication terminal 10 as stated above.
  • the radio access node 100 may further be configured, e.g. by comprising a scheduling module 1103 , to adjust or reschedule the data transmission based on the received indication.
  • the scheduling module 1103 may be configured to reschedule the data channel based on the received indication as stated above.
  • the scheduling module 1103 may be configured to reschedule the data channel by being configured to schedule a same redundancy version again as the previously scheduled data to optimize a reception of a transport block in the communication terminal 10.
  • the embodiments herein for handling communication may be implemented through one or more processors 1104 in the radio access node 100 depicted in Fig. 11 , e.g. together with computer program code, which processor 1104 or processing means is configured to perform the functions and/or method actions of the embodiments herein.
  • the radio access node 100 further comprises a memory 1105.
  • the memory comprises one or more units to be used to store data on, such as DCI information, LBT information, applications to perform the methods disclosed herein when being executed, and similar.
  • the methods according to the embodiments described herein for the radio access node 100 may be implemented by means of e.g. a computer program 1106 or a computer program product, comprising instructions, i.e., software code portions, which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the radio access node 100.
  • the computer program 1106 may be stored on a computer-readable storage medium 1107 , e.g. a disc or similar.
  • the computer-readable storage medium 1107, having stored thereon the computer program 1106, may comprise the instructions which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the radio access node 100.
  • the computer-readable storage medium 1107 may be a non-transitory computer-readable storage medium.
  • Fig. 12 is a block diagram depicting the communication terminal 10 according to embodiments herein.
  • the communication terminal 10 is configured to be served by the radio access node 100, e.g. the first radio access node 13, in the first cell 11 on a carrier of a licensed frequency spectrum and by a different radio access node e.g. second radio access node 12, in the second cell 14 on a carrier of an unlicensed frequency spectrum.
  • the different cells may in some embodiments be served by one and the same radio access node, e.g. second radio access node 12.
  • the communication terminal 10 may be configured to be scheduled in the second cell 14 by the radio access node serving the first cell 11, i.e. cross-carrier scheduled in the second cell 14, e.g. by the first radio access node 13 or second radio access node 12.
  • Embodiments herein provide the communication terminal 10 for handling communication.
  • the communication terminal 10 is configured to communicate with the radio access node in the first cell 11 on the carrier of the licensed frequency spectrum and to be cross-carrier scheduled in the second cell 14 on the carrier of the unlicensed frequency spectrum by the radio access node via the first cell 11.
  • the communication terminal 10 is configured to receive the indication that data may be scheduled for the communication terminal 10 on the data channel in the second cell 14.
  • the communication terminal 10 may be configured to receive the indication that data may be scheduled for the communication terminal 10 by being configured to receive a reference signal on the second cell 14 that indicates to the communication terminal 10 that the carrier of the unlicensed frequency spectrum has been occupied by the second cell 14.
  • the reference signal may in some embodiments further indicate to the communication terminal 10 whether the data channel is present in a subframe or not.
  • the reference signal may be common for all communication terminals operating on the second cell 14.
  • the reference signal may be specific to the communication terminal 10. In this case the reference signal may be located within the data channel.
  • the communication terminal 10 may be configured to receive the indication that data may be scheduled for the communication terminal 10 by being configured to receive on the first cell, control information of the second cell 14.
  • the control information indicates where in a subframe the data channel is scheduled in the second cell 14 for the communication terminal 10.
  • the communication terminal 10 may then be configured to attempt to detect the data channel in the subframe.
  • the communication terminal 10 may be configured to receive the indication that data may be scheduled for the communication terminal 10 by being configured to receive a reference signal on the second cell 14 that indicates to the communication terminal 10 that the carrier of the unlicensed frequency spectrum has been occupied by the second cell 14.
  • the communication terminal 10 is configured to attempt to detect presence of the data channel intended for the communication terminal 10.
  • the communication terminal 10 may be configured to detect presence of the data channel blindly.
  • the communication terminal 10 is further configured to, in case the communication terminal 10 detects presence of the data channel intended for the communication terminal 10, decode the data channel.
  • the communication terminal 10 is also configured to, in case the communication terminal 10 does not detect presence of the data channel intended for the communication terminal 10, indicate a non-detection of the data channel to the radio access node.
  • the communication terminal may be configured to indicate the non-detection by being configured to transmit a NACK or a DTX state on the first cell 11.
  • the communication terminal may be configured to indicate the non-detection by being configured to indicate on the first cell 11 that the communication terminal 10 has received the scheduling DCI message but not received the data channel associated with the scheduling DCI message.
  • the communication terminal may be configured to receive on the first cell, the NDI bit, which NDI bit indicates how to indicate that the communication terminal 10 has received the scheduling DCI message but not received the data channel associated with the scheduling DCI message.
  • the communication terminal may be configured to reset the HARQ process when the data channel is detected and corresponds to information in the DCI message; or independently of whether the data channel is detected or not.
  • the data channel is scheduled with a DMRS based transmission scheme and the communication terminal 10 may be configured to attempt detect the data channel by being configured to search for a DMRS on scheduled PRBs, and based on an outcome of the searching, to judge whether or not the communication terminal 10 is scheduled in the PRBs.
  • the data channel is scheduled with a Cell Specific Reference Signal based transmission scheme; and the communication terminal 10 may be configured to attempt to detect the data channel by being configured to validate allocated PRBs. If the allocated PRBs are consistent with information given in the DCI message, to determine the data channel to be detected, and if the allocated PRBs are not consistent with the information given in the scheduling DCI message, the communication terminal 10 may be configured to determine the data channel not to be present.
  • the communication terminal 10 may be configured to attempt to detect presence of the data channel by being configured to correlate received reference signal sequences with a set of known sequences, and when the correlation is above a threshold for matching, the presence of the data channel intended for the communication terminal 10 is considered detected.
  • the communication terminal 10 may be configured, e.g. by comprising a receiving module 1201 , to receive an indication that data may be scheduled for the communication terminal 10 in the second cell 14.
  • the indication may be received on the first cell and/or on the second cell 14.
  • the indication may be control information, scheduling information or DCI of the second cell 14, which control information indicates where in a subframe data, PDSCH, is scheduled in the second cell 14.
  • the communication terminal 10 is configured, e.g. by comprising a detecting module 1202 , to detect, e.g. independently of the received control information, a presence of PDSCH intended for the communication terminal 10 by comparing reference signals in a received transmission from the second radio access node 12.
  • the communication terminal 10 detects the presence of PDSCH intended for the communication terminal 10, the communication terminal 10 is configured, e.g. by comprising a decoding module 1203 , to decode the PDSCH.
  • the communication terminal 10 is configured, e.g. by comprising an indicating module 1204 , to indicate a non-detection of PDSCH on the first cell 11.
  • the receiving module 1201 may be configured to receive the indication that data may be scheduled for the communication terminal 10 by being configured to receive a reference signal on the second cell 14 that indicates to the communication terminal 10 that the carrier of the unlicensed frequency spectrum has been occupied by the second cell 14.
  • the reference signal may in some embodiments further indicate to the communication terminal 10 whether the data channel is present in a subframe or not.
  • the reference signal may be common for all communication terminals operating on the second cell 14.
  • the reference signal may be specific to the communication terminal 10. In this case the reference signal may be located within the data channel.
  • the receiving module 1201 may be configured to receive the indication that data may be scheduled for the communication terminal 10 on the data channel in the second cell 14.
  • the receiving module 1201 may be configured to receive the indication that data may be scheduled for the communication terminal 10 by being configured to receive on the first cell, control information of the second cell 14.
  • the control information indicates where in a subframe the data channel is scheduled in the second cell 14 for the communication terminal 10.
  • the detecting module 1202 may then be configured to attempt to detect the data channel in the subframe.
  • the detecting module 1202 may be configured to attempt to detect presence of the data channel intended for the communication terminal 10.
  • the detecting module 1202 may be configured to detect presence of the data channel blindly.
  • the decoding module 1203 may further be configured to, in case the detecting module 1202 detects presence of the data channel intended for the communication terminal 10, decode the data channel.
  • the indicating module 1204 may be configured to, in case the detecting module 1202 does not detect presence of the data channel intended for the communication terminal 10, indicate a non-detection of the data channel to the radio access node.
  • the indicating module 1204 may be configured to indicate the non-detection by being configured to transmit a NACK or DTX state on the first cell 11.
  • the indicating module 1204 may be configured to indicate the non-detection by being configured to indicate on the first cell 11 that the communication terminal 10 has received the scheduling DCI message but not received the data channel associated with the scheduling DCI message.
  • the receiving module 1201 may be configured to receive on the first cell, the NDI bit, which NDI bit indicates how to indicate that the communication terminal 10 has received the scheduling DCI message but not received the data channel associated with the scheduling DCI message.
  • the data channel is scheduled with a DMRS based transmission scheme and the receiving module 1201 may be configured to attempt to detect the data channel by being configured to search for a DMRS on scheduled PRBs, and based on an outcome of the searching, to judge whether or not the communication terminal 10 is scheduled.
  • the data channel is scheduled with a Cell Specific Reference Signal based transmission scheme; and the detecting module 1202 may be configured to attempt to detect the data channel by being configured to validate allocated PRBs. If the allocated PRBs are consistent with the information given in the DCI message, the detecting module 1202 may be configured to determine the data channel to be detected, and if the allocated PRBs are not consistent with the information given in the scheduling DCI message, the detecting module 1202 may be configured to determine the data channel not to be present.
  • the detecting module 1202 may be configured to attempt to detect by being configured to correlate received reference signal sequences with a set of known sequences, and when the correlation is above a threshold for matching, the presence of the data channel intended for the communication terminal 10 is considered detected.
  • the embodiments herein for handling communication with the radio access node may be implemented through one or more processors 1205 in the communication terminal 10 depicted in Fig. 12 , e.g. together with computer program code, which processor 1205 or processing means is configured to perform the functions and/or method actions of the embodiments herein.
  • the communication terminal 10 further comprises a memory 1206.
  • the memory comprises one or more units to be used to store data on, such as DCI information, PQI information, reference signals, applications to perform the methods disclosed herein when being executed, and similar.
  • the methods according to the embodiments described herein for the communication terminal 10 may be implemented by means of e.g. a computer program 1207 or a computer program product, comprising instructions, i.e., software code portions, which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the communication terminal 10.
  • the computer program 1207 may be stored on a computer-readable storage medium 1208 , e.g. a disc or similar.
  • the computer-readable storage medium 1208, having stored thereon the computer program 1207 may comprise the instructions which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the communication terminal 10.
  • the computer-readable storage medium 1208 may be a non-transitory computer-readable storage medium.
  • a method performed in a radio access node schedules a communication terminal in a cross carrier manner, i.e. the radio access node schedules transmissions for the communication terminal in a first cell served by the radio access node, referred below as a first radio access node, but also for a second cell controlled by a different radio access node, referred below as a second radio access node, wherein the second cell is of or belongs to an unlicensed frequency spectrum.
  • the first cell may be a primary cell and the second cell may be a secondary cell.
  • the radio access node transmits control information to the communication terminal, which control information indicates where data is scheduled in the second cell.
  • the radio access node receives an indication that the communication terminal has not received the data transmission.
  • the radio access node adjusts or reschedules the data transmission based on the received indication.
  • a method performed in a communication terminal detects, independently of received control information, also referred to as blindly detecting, a presence of PDSCH intended for the communication terminal by comparing reference signals in a received transmission from the second radio access node.
  • the communication terminal detects the presence of PDSCH intended for the communication terminal, the communication terminal decodes the PDSCH.
  • control information indicates PDSCH but the communication terminal does not detect the presence of PDSCH intended for the communication terminal, the communication terminal indicates a non-detection of PDSCH to the first radio access node.
  • functions means or modules may be implemented using digital logic and/or one or more microcontrollers, microprocessors, or other digital hardware. In some embodiments, several or all of the various functions may be implemented together, such as in a single application-specific integrated circuit (ASIC), or in two or more separate devices with appropriate hardware and/or software interfaces between them. Several of the functions may be implemented on a processor shared with other functional components of a communication terminal or radio access node, for example.
  • ASIC application-specific integrated circuit
  • processors or processing means discussed may be provided through the use of dedicated hardware, while others are provided with hardware for executing software, in association with the appropriate software or firmware.
  • processor or “controller” as used herein does not exclusively refer to hardware capable of executing software and may implicitly include, without limitation, digital signal processor (DSP) hardware, read-only memory (ROM) for storing software, random-access memory for storing software and/or program or application data, and non-volatile memory.
  • DSP digital signal processor
  • ROM read-only memory
  • RAM random-access memory
  • non-volatile memory non-volatile memory
  • Other hardware conventional and/or custom, may also be included. Designers of communications receivers will appreciate the cost, performance, and maintenance tradeoffs inherent in these design choices.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (13)

  1. Verfahren, das durch ein Kommunikationsendgerät (10) zum Handhaben von Kommunikation ausgeführt wird, wobei das Kommunikationsendgerät (10) bedient wird von einem Funkzugangsknoten (12, 13) in einer ersten Zelle (11) auf einem Träger eines lizenzierten Frequenzspektrums und trägerübergreifend geplant ist in einer zweiten Zelle (14) auf einem Träger eines unlizenzierten Frequenzspektrums durch den Funkzugangsknoten (12, 13) über die erste Zelle (11), wobei das Verfahren umfasst:
    - Empfangen (712), auf der ersten Zelle (11), einer Planungs-Downlink-Steuerinformationsnachricht, DCI-Nachricht, die angibt, dass Daten für das Kommunikationsendgerät (10) auf einem Datenkanal in der zweiten Zelle (14) geplant sind;
    - Versuchen (713), das Vorhandensein des für das Kommunikationsendgerät (10) vorgesehenen Datenkanals zu erkennen;
    - im Fall, dass das Kommunikationsendgerät (10) das Vorhandensein des für das Kommunikationsendgerät (10) vorgesehenen Datenkanals erkennt, Decodieren (714) des Datenkanals; und im Fall, dass das Kommunikationsendgerät das Vorhandensein des für das Kommunikationsendgerät (10) vorgesehenen Datenkanals nicht erkennt, Angeben (715) gegenüber dem Funkzugangsknoten (12, 13), dass das Kommunikationsendgerät (10) die Planungs-DCI-Nachricht empfangen hat, aber den der Planungs-DCI-Nachricht zugeordneten Datenkanal nicht empfangen hat, indem es einen Diskontinuierliche-Übertragung-Zustand, DTX-Zustand, auf der ersten Zelle (11) angibt.
  2. Verfahren nach Anspruch 1, wobei das Empfangen (712) das Empfangen einer Steuerinformation für die zweite Zelle (14) auf der ersten Zelle (11) umfasst, wobei die Steuerinformation angibt, wo in einem Unterrahmen der Datenkanal in der zweiten Zelle (14) für das Kommunikationsendgerät (10) geplant ist und wobei das Kommunikationsendgerät (10) versucht, den Datenkanal in dem Unterrahmen zu erkennen.
  3. Verfahren nach einem der Ansprüche 1-2, wobei das Empfangen (712) das Empfangen eines Referenzsignals auf der zweiten Zelle (14) umfasst, das dem Kommunikationsendgerät (10) angibt, dass der Träger des unlizenzierten Frequenzspektrums von der zweiten Zelle (14) belegt wurde.
  4. Verfahren nach Anspruch 3, wobei das Referenzsignal ferner dem Kommunikationsendgerät (10) angibt, ob der Datenkanal in einem Unterrahmen vorhanden ist oder nicht, und wobei das Kommunikationsendgerät (10) versucht, den Datenkanal zu erkennen, wenn das Referenzsignal angibt, dass der Datenkanal in dem Unterrahmen vorhanden ist.
  5. Verfahren nach einem der Ansprüche 1-4, ferner umfassend
    - Empfangen (711), auf der ersten Zelle (11), eines Neudatenindikator-Bits, NDI-Bits, wobei das NDI-Bit angibt, wie anzugeben ist, dass das Kommunikationsendgerät (10) die Planungs-DCI-Nachricht empfangen hat, nicht aber den Datenkanal empfangen hat, der der Planungs-DCI-Nachricht zugeordnet ist.
  6. Verfahren nach Anspruch 5, ferner umfassend
    - Zurücksetzen (716) eines hybriden automatischen Anforderungsprozesses, wenn der Datenkanal erkannt wird und der Information in der Planungs-DCI-Nachricht entspricht; oder unabhängig davon, ob der Datenkanal erkannt wird oder nicht.
  7. Verfahren nach einem der Ansprüche 1-6, wobei die Daten auf dem Datenkanal mit einem Demodulations-Referenzsignal-basierten Übertragungsschema, DMRS-basierten Übertragungsschema, geplant sind und wobei das Versuchen (713), den Datenkanal zu erkennen, das Suchen nach einem DMRS auf geplanten physischen Ressourcenblöcken, PRBs, umfasst; und basierend auf einem Ergebnis der Suche, Beurteilen, ob der für das Kommunikationsendgerät (10) vorgesehene Datenkanal in den PRBs geplant ist oder nicht.
  8. Verfahren nach einem der Ansprüche 1-7, wobei die Daten auf dem Datenkanal mit einem auf einem zellenspezifischen Referenzsignal basierten Übertragungsschema geplant sind; wobei das Versuchen (713), den Datenkanal zu erkennen, das Validieren zugeordneter physischer Ressourcenblöcke, PRBs, umfasst, und wenn die zugeordneten PRBs mit der in der Planungs-DCI-Nachricht angegebenen Information übereinstimmen, das Bestimmen des zu erkennenden Datenkanals, und wenn die zugeordneten PRBs nicht mit der in der Planungs-DCI-Nachricht angegebenen Information übereinstimmen, bestimmt wird, dass der Datenkanal nicht vorhanden ist.
  9. Verfahren, das von einem Funkzugriffsknoten (12) zum Handhaben von Kommunikation mit einem Kommunikationsendgerät (10) in einer zweiten Zelle (14) auf einem Träger eines unlizenzierten Frequenzspektrums durchgeführt wird, wobei Ressourcen für die Kommunikation mit dem Kommunikationsendgerät (10) in der zweiten Zelle (14) trägerübergreifend von einer ersten Zelle (11) auf einem Träger eines lizenzierten Frequenzspektrums geplant sind; wobei das Verfahren umfasst:
    - Übertragen (721) an das Kommunikationsendgerät (10) auf der ersten Zelle (11), einer Planungs-Downlink-Steuerinformationsnachricht, DCI-Nachricht, die angibt, dass Daten für das Kommunikationsendgerät (10) auf einem Datenkanal in der zweiten Zelle (14) geplant sind;
    - Empfangen (722) einer Angabe, dass das Kommunikationsendgerät (10) die Planungs-DCI-Nachricht empfangen hat, aber den der Planungs-DCI-Nachricht zugeordneten Datenkanal nicht empfangen hat, wobei die Angabe eine Diskontinuierliche-Übertragung-Antwort, DTX-Antwort, des Kommunikationsendgeräts (10) auf der ersten Zelle (11) ist; und
    - Neuplanung (723) der Daten auf dem Datenkanal basierend auf der empfangenen Angabe.
  10. Verfahren nach Anspruch 9, wobei das Übertragen (721) das Durchführen eines Listen-Before-Talk-Prozesses, LBT-Prozesses, auf dem Träger des unlizenzierten Spektrums und das Übertragen der Planungs-DCI-Nachricht nur umfasst, wenn das Ergebnis des LBT-Prozesses ist, dass der Träger des unlizenzierten Frequenzspektrums frei ist.
  11. Verfahren nach einem der Ansprüche 9-10, ferner umfassend
    - Übertragen (720) an das Kommunikationsendgerät (10) auf der ersten Zelle (11), eines Neudatenindikator-Bits, NDI-Bits, wobei das NDI-Bit angibt, wie anzugeben ist, dass das Kommunikationsendgerät (10) die Planungs-DCI-Nachricht empfangen hat, nicht aber den Datenkanal empfangen hat, der der Planungs-DCI-Nachricht zugeordnet ist.
  12. Kommunikationsendgerät (10) zum Handhaben von Kommunikation, wobei das Kommunikationsendgerät (10) dazu konfiguriert ist, mit einem Funkzugangsknoten (12, 13) in einer ersten Zelle (11) auf einem Träger eines lizenzierten Frequenzspektrums zu kommunizieren und trägerübergreifend in einer zweiten Zelle (14) auf einem Träger eines unlizenzierten Frequenzspektrums durch den Funkzugangsknoten (12, 13) über die erste Zelle (11) geplant zu sein, wobei das Kommunikationsendgerät konfiguriert ist zum:
    Empfangen, auf der ersten Zelle (11), einer Planungs-Downlink-Steuerinformationsnachricht, DCI-Nachricht, die angibt, dass Daten für das Kommunikationsendgerät (10) auf einem Datenkanal in der zweiten Zelle (14) geplant sind;
    Versuchen, das Vorhandensein des für das Kommunikationsendgerät (10) vorgesehenen Datenkanals zu erkennen; und
    im Fall, dass das Kommunikationsendgerät (10) das Vorhandensein des für das Kommunikationsendgerät (10) vorgesehenen Datenkanals erkennt, Decodieren des Datenkanals; und im Fall, dass das Kommunikationsendgerät das Vorhandensein des für das Kommunikationsendgerät (10) vorgesehenen Datenkanals nicht erkennt, Angeben gegenüber dem Funkzugangsknoten (12, 13), dass das Kommunikationsendgerät (10) die Planungs-DCI-Nachricht empfangen hat, aber den der Planungs-DCI-Nachricht zugeordneten Datenkanal nicht empfangen hat, indem es dazu konfiguriert ist, einen Diskontinuierliche-Übertragung-Zustand, DTX-Zustand, auf der ersten Zelle (11) anzugeben.
  13. Funkzugriffsknoten (12) zum Handhaben von Kommunikation mit einem Kommunikationsendgerät (10) in einer zweiten Zelle (14) auf einem Träger eines unlizenzierten Frequenzspektrums, wobei Ressourcen für die Kommunikation mit dem Kommunikationsendgerät (10) in der zweiten Zelle (14) trägerübergreifend von einer ersten Zelle (11) auf einem Träger eines lizenzierten Frequenzspektrums geplant sind; wobei der Funkzugriffsknoten (12) konfiguriert ist zum:
    Übertragen, an das Kommunikationsendgerät (10) auf der ersten Zelle (11), einer Planungs-Downlink-Steuerinformationsnachricht, DCI-Nachricht, die angibt, dass Daten für das Kommunikationsendgerät (10) auf einem Datenkanal in der zweiten Zelle (14) geplant sind;
    Empfangen einer Angabe, dass das Kommunikationsendgerät (10) die Planungs-DCI-Nachricht empfangen hat, aber den der Planungs-DCI-Nachricht zugeordneten Datenkanal nicht empfangen hat, wobei die Angabe eine Diskontinuierliche-Übertragung-Antwort, DTX-Antwort, des Kommunikationsendgeräts (10) auf der ersten Zelle (11) ist; und
    Neuplanen der Daten auf dem Datenkanal basierend auf der empfangenen Angabe.
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